hometown/app/services/activitypub/fetch_remote_status_service.rb
ThibG 7467361d70 Fetch boosted statuses on behalf of a follower (fixes #7426) (#7459)
When an ActivityPub Announce is processed and the boosted toot is not known,
fetch it on behalf of one of the booster's followers. This is to allow
fetching self-boosts of previously-unknown private toots.

If fetching on behalf of a user fails, try fetching it anonymously: the
selected follower of a boosting user may be banned by the boosted toot's
author.
2018-05-12 16:48:32 +02:00

53 lines
1.5 KiB
Ruby

# frozen_string_literal: true
class ActivityPub::FetchRemoteStatusService < BaseService
include JsonLdHelper
# Should be called when uri has already been checked for locality
def call(uri, id: true, prefetched_body: nil, on_behalf_of: nil)
@json = if prefetched_body.nil?
fetch_resource(uri, id, on_behalf_of)
else
body_to_json(prefetched_body)
end
return unless supported_context? && expected_type?
return if actor_id.nil? || !trustworthy_attribution?(@json['id'], actor_id)
actor = ActivityPub::TagManager.instance.uri_to_resource(actor_id, Account)
actor = ActivityPub::FetchRemoteAccountService.new.call(actor_id, id: true) if actor.nil? || needs_update(actor)
return if actor.nil? || actor.suspended?
ActivityPub::Activity.factory(activity_json, actor).perform
end
private
def activity_json
{ 'type' => 'Create', 'actor' => actor_id, 'object' => @json }
end
def actor_id
value_or_id(first_of_value(@json['attributedTo']))
end
def trustworthy_attribution?(uri, attributed_to)
return false if uri.nil? || attributed_to.nil?
Addressable::URI.parse(uri).normalized_host.casecmp(Addressable::URI.parse(attributed_to).normalized_host).zero?
end
def supported_context?
super(@json)
end
def expected_type?
equals_or_includes_any?(@json['type'], ActivityPub::Activity::Create::SUPPORTED_TYPES + ActivityPub::Activity::Create::CONVERTED_TYPES)
end
def needs_update(actor)
actor.possibly_stale?
end
end